Form 8.3 - AON PLC

DEALINGS BY PERSONS WITH INTERESTS IN RELEVANT SECURITIES REPRESENTING 1% OR MORE

1.

KEY INFORMATION

Name of person dealing

Massachusetts Financial Services Company

Company dealt in

AON PLC

Class of relevant security to which the

dealings being disclosed relate

Class A Ordinary Shares (IE00BLP1HW54)

Date of dealing

15 May 2020

2.

INTERESTS AND SHORT POSITIONS

(a)

Interests and short positions (following dealing) in the class of relevant security

dealt in

Long

Short

Number

(%)

Number

(%)

(1)

Relevant securities

21,521,426 shares

9.31 %

(2)

Derivatives (other than options):

(3)

Options and agreements to purchase/sell:

Total

21,521,426 shares

9.31 %

(b)

Interests and short positions in relevant securities of the company, other than the

class dealt in

Class of relevant security:

Long

Short

Number

(%)

Number

(%)

(1)

Relevant securities

(2)

Derivatives (other than options):

(3)

Options and agreements to purchase/sell:

Total

3.

DEALINGS

(a)

Purchases and sales

Purchase/sale

Number of relevant securities

Price per unit

In-Kind Received

46 shares

191.6700 USD

In-Kind Received

13 shares

193.9300 USD

In-Kind Delivered

255 shares

191.6700 USD

Purchase

4,138 shares

192.0277 USD

Purchase

2,662 shares

191.8398 USD

Purchase

393 shares

191.8100 USD

Sale

129 shares

191.7622 USD

Sale

722 shares

191.7273 USD

Sale

2,559 shares

191.4930 USD

Sale

40,772 shares

191.9717 USD

(b)

Derivatives transactions (other than options transactions)

Product name

e.g. CFD

Nature of transaction

Number of relevant securities

Price per unit

(c)

Options transactions in respect of existing relevant securities

(i)

Writing, selling, purchasing or varying

Product name e.g. call option

Writing, purchasing, selling, varying etc.

Number of securities to which the option relates

Exercise price

Type, e.g. American, European etc.

Expiry date

Option money paid/ received per unit

(ii)

Exercising

Product name

e.g. call option

Number of securities

Exercise price per unit

(d)

Other dealings (including subscribing for new securities)

Nature of transaction

Details

Price per unit (if applicable)

4.

OTHER INFORMATION

Agreements, arrangements or understandings relating to options or derivatives

Full details of any agreement, arrangement or understanding between the person disclosing and any other person relating to the voting rights of any relevant securities under any option referred to on this form or relating to the voting rights or future acquisition or disposal of any relevant securities to which any derivative referred to on this form is referenced. If none, this should be stated.